Dampness prevention function-equipped insole, and shoe and slipper including the insole

ABSTRACT

Provided is a dampness prevention function-equipped insole ( 50 ) including an upper layer portion ( 11 ) formed in a foot shape, with small holes ( 4 ) being formed therein, an intermediate layer portion ( 51 ) including tubes ( 12   a ) in which air holes ( 5 ) are bored at positions corresponding to the small holes ( 4 ), the tubes ( 12   a ) being installed in a front-rear direction at a front part and a rear part and being installed in a left-right direction in a middle part, and a lower layer portion ( 13 ) in which mesh cloth woven in a lattice shape is formed in the foot shape, in which the insole ( 50 ) is formed in the foot shape and placed in a shoe in which the upper layer portion ( 11 ), the intermediate layer portion ( 51 ), and the lower layer portion ( 13 ) are sewn such that the tubes ( 12   a ) maintain a predetermined interval.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation application of International Application No. PCT/JP2014/081628, filed Nov. 28, 2014. The content of this application is incorporated herein by reference in its entirety.

BACKGROUND

Field

The present invention relates to a dampness prevention function-equipped insole that prevents dampness by ejecting air to the sole of the foot inside a shoe, and a shoe and a slipper including the insole.

Description of the Related Art

A dampness prevention function-equipped insole for a sole has been commercially available as a shoe or an insole having a function of ventilating an inside of a shoe in order to prevent dampness at the sole of the foot. In addition, for example, the present applicant discloses a technology related to the dampness prevention function-equipped insole in Japanese Registered Utility Model No. 3166236 (hereinafter referred to as “JP-U3166236”). A description will be given of the dampness prevention function-equipped insole of JP-U3166236.

FIG. 15(a) is a dampness prevention function-equipped insole (hereinafter referred to as insole) 10 according to JP-U3166236, and the insole 10 formed in a foot shape has a three-layer structure as illustrated in FIGS. 15(b) to 15(d). A configuration of the insole 10 includes an upper layer portion 1 formed of skin 1 a of leather or synthetic leather, an intermediate layer portion 2 in which resilient tubes 2 a made of resin are arranged side by side, and a lower layer portion 3 formed of breathable mesh cloth 3 a. Further, these three layers are sewn with a sewing thread 6 to separate the respective tubes 2 a forming the intermediate layer portion 2.

A plurality of small holes 4 bored at a heel side and a toe side is formed along the separated tubes 2 a in the skin 1 a of the upper layer portion 1 of the insole 10 to ensure air permeability of the upper layer portion 1 and the lower layer portion 3 of the insole 10.

Several air holes 5 are bored in the tubes 2 a of the intermediate layer portion 2 at positions corresponding to a heel and a toe part, respectively, and the air holes 5 are formed such that positions thereof are consistent with the small holes 4 of the facing skin 1 a. Tubes 2 a made of resin such as silicone are adopted as the tubes 2 a having hollow structures and are formed of a resin material having strong elasticity that restores an original shape when the tubes 2 a are crushed by walking.

When mesh cloth 3 a woven in a lattice shape with a synthetic fiber is used as the mesh cloth 3 a, the mesh cloth 3 a of the lower layer portion 3 has a function of reliably holding the foot without the insole 10 slipping during walking due to appropriate friction with a shoe sole 31 (FIGS. 16(a) to 16(c)) and a function of enhancing air permeability of the insole 10 by circulating air.

Further, when the lower layer portion 3 of the insole 10 is formed with the mesh cloth 3 a, it is possible to prevent the insole 10 from being damp by diffusing moisture in the sole absorbed by the skin included in the upper layer portion 1.

SUMMARY

However, the dampness prevention function-equipped insole of JP-U3166236 has the following problems.

As illustrated in FIGS. 16(a) to 16(c), when the insole is continuously used, the tubes 2 a of the intermediate layer portion 2 meander in a space interposed between the upper layer portion 1 and the lower layer portion 3, and the positions of the air holes 5 of the tubes 2 a are shifted from the positions of the small holes 4 of the upper layer portion 1. FIG. 16 (a) is a cross-sectional view of the insole 10 in use, FIG. 16 (b) is a diagram illustrating a state before the tubes 2 a meander, and FIG. 16 (c) is a diagram illustrating a state after the tubes 2 a meander. As a result, there has been a problem that air on the sole side may not be sufficiently circulated, and a sufficient dampness prevention function may not be exhibited. The problem is considered to result from the fact that a cross-sectional shape of the tube 2 a is a circular shape and moves in the gap between the upper layer portion 1 and the lower layer portion 3. Furthermore, since the intermediate layer portion 2 of the insole 10 includes the plurality of linear tubes 2 a installed from the heel side to the toe side of the foot, there has been a problem that both left and right sides warp after use for a long time.

The invention has been conceived to solve the above-mentioned problems, and an object of the invention is to provide a dampness prevention function-equipped insole that sufficiently exhibits a dampness prevention function after use for a long time, and a shoe and a slipper including the insole.

The invention has configurations below to solve the above-mentioned problems.

(1) A dampness prevention function-equipped insole including:

an upper layer portion formed in a foot shape in which a plurality of small holes is formed on the upper layer portion;

an intermediate layer portion including a plurality of tubes in which a plurality of air holes is bored at positions corresponding to the small holes, the plurality of tubes being installed in a front-rear direction of the foot shape at a front part and a rear part of the foot shape and being installed in a left-right direction of the foot shape in a middle part of the foot shape; and

a lower layer portion in which a mesh cloth woven in a lattice shape is formed in the foot shape,

in which the dampness prevention function-equipped insole is formed in the foot shape and placed in a shoe, and

in which the upper layer portion, the intermediate layer portion, and the lower layer portion are sewn such that the plurality of tubes maintains a predetermined interval.

(2) The dampness prevention function-equipped insole according to (1), in which cross-sectional shapes of the plurality of tubes have any one of a circular shape, an elliptical shape, and a trapezoidal shape.

(3) The dampness prevention function-equipped insole according to (1), in which the upper layer portion is made of a leather material or a sponge material.

(4) A dampness prevention function-equipped insole including:

an upper layer portion and a lower layer portion in which a mesh cloth woven in a lattice shape is formed in a foot shape; and

an intermediate layer portion including a plurality of tubes, the plurality of tubes being installed in a front-rear direction of the foot shape at a front part and a rear part of the foot shape and being installed in a left-right direction of the foot shape in a middle part of the foot shape,

in which the dampness prevention function-equipped insole is formed in the foot shape and placed in a shoe, and

in which the upper layer portion, the intermediate layer portion, and the lower layer portion are sewn such that the plurality of tubes maintains a predetermined interval.

(5) The dampness prevention function-equipped insole according to (4), in which the mesh cloth of the lower layer portion is finer than the mesh cloth of the upper layer portion.

(6) The dampness prevention function-equipped insole according to (1) or (4), in which one of the plurality of tubes of the intermediate layer portion is formed in a U-shape from a heel part along a peripheral portion of a side part of a foot.

(7) The dampness prevention function-equipped insole according to (6),

in which a one-layer or two-layer tube formed in a U-shape is further loaded above the tube formed in the U-shape in the intermediate layer portion, and

the upper layer portion and the lower layer portion have side surface portions to interpose the loaded U-shaped tube therebetween.

(8) The dampness prevention function-equipped insole according to (7), in which a double-sided adhesive tape is installed on a surface of the side surface portion of the lower layer portion.

(9) A dampness prevention function-equipped insole including:

an upper layer portion formed in the foot shape, a plurality of small holes being formed on a heel side and in a front part;

an intermediate layer portion including a plurality of tubes having elliptical cross-sectional shapes installed in a front-rear direction of the foot shape in which a plurality of air holes is bored at positions corresponding to the small holes; and

a lower layer portion in which a mesh cloth woven in a lattice shape is formed in the foot shape,

in which the dampness prevention function-equipped insole is formed in the foot shape and placed in a shoe, and

in which the upper layer portion, the intermediate layer portion, and the lower layer portion are sewn such that the plurality of tubes maintains a predetermined interval.

(10) The dampness prevention function-equipped insole according to (9), in which one of the plurality of tubes of the intermediate layer portion is formed in a U-shape from a heel part along a peripheral portion of a side part of a foot, and a cross-sectional area of the tube formed in the U-shape is larger than a cross-sectional area of other tubes.

(11) The dampness prevention function-equipped insole according to (9) or (10), in which the upper layer portion is made of a leather member or a sponge material.

(12) The dampness prevention function-equipped insole according to any one of (9) to (11), in which the cross-sectional shapes of the plurality of tubes have a trapezoidal shape.

(13) A shoe having the dampness prevention function-equipped insole according to any one of (1) to (12), in which air holes are provided at a toe tip part and a heel part of the shoe.

(14) The shoe according to (13), in which a waterproof and moisture permeable material is installed inside portions in which the air holes of the shoe are formed.

(15) A slipper in which the dampness prevention function-equipped insole according to any one of (1) to (12) is used as a slipper bottom piece.

According to the invention, it is possible to provide a dampness prevention function-equipped insole that sufficiently exhibits a dampness prevention function after use for a long time, and a shoe and a slipper including the insole.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1(a) to 1(c) are diagrams illustrating a configuration of a dampness prevention function-equipped insole of Embodiment 1.

FIGS. 2(a) to 2(c) are diagrams illustrating another configuration of the dampness prevention function-equipped insole of Embodiment 1.

FIGS. 3(a) and 3(b) are diagrams illustrating intermediate layer portions of an elliptical section tube and a trapezoidal section tube of Embodiment 1.

FIGS. 4(a) and 4(b) are diagrams illustrating a usage state of the dampness prevention function-equipped insole of Embodiment 1.

FIGS. 5(a) and 5(b) are diagrams illustrating a usage state of another dampness prevention function-equipped insole of Embodiment 1.

FIGS. 6(a) to 6(c) are diagrams illustrating a flow of air inside the dampness prevention function-equipped insole of Embodiment 1.

FIG. 7 is a diagram illustrating dampness prevention function-equipped slippers of Embodiment 2.

FIGS. 8(a) and 8(b) are diagrams illustrating a shoe using a dampness prevention function-equipped insole of Embodiment 3.

FIGS. 9(a) to 9(d) are diagrams illustrating a configuration of a dampness prevention function-equipped insole of Embodiment 4.

FIGS. 10(a) to 10(d) are diagrams illustrating a configuration of another dampness prevention function-equipped insole of Embodiment 4.

FIGS. 11(a) to 11(c) are diagrams illustrating a configuration of a dampness prevention function-equipped insole of Embodiment 5.

FIGS. 12(a) to 12(c) are diagrams illustrating a usage state of the dampness prevention function-equipped insole of Embodiment 5.

FIGS. 13(a) to 13(c) are diagrams illustrating a configuration of another dampness prevention function-equipped insole of Embodiment 5.

FIGS. 14(a) to 14(c) are diagrams illustrating a usage state of another dampness prevention function-equipped insole of Embodiment 5.

FIGS. 15(a) to 15(d) are diagrams illustrating a configuration of a conventional dampness prevention function-equipped insole.

FIGS. 16(a) to 16(c) are diagrams illustrating a usage state and a meandering state of a tube of the conventional dampness prevention function-equipped insole.

DETAILED DESCRIPTION

Embodiments for carrying out the invention will be described below with reference to drawings.

Embodiment 1

[Configuration of Dampness Prevention Function-Equipped Insole]

A dampness prevention function-equipped insole (hereinafter referred to as insole) of the present embodiment is characterized by employing an elliptical section tube 12 a for solving a problem due to meandering of the tube 2 a in the conventional insole, that is, a problem of a position gap between the small holes 4 and the air holes 5. FIGS. 1(a) to 1(c) are diagrams illustrating a configuration of the dampness prevention function-equipped insole of the present embodiment. The basic configuration is the same as that of the conventional insole 10. That is, the insole includes an upper layer portion 11, an intermediate layer portion 12, and a lower layer portion 13, which are sewed and finished by a sewing thread 6. In FIG. 1, the upper layer portion 11 is of a leather material, and a mesh material is used as the lower layer portion 13. Drying of sweat at the sole of the foot may be promoted by adopting the mesh material for the lower layer portion 13. In addition, for example, when the insole 20 is used in leather shoes, a luxurious feel of the shoes may be maintained by adopting the leather material for the upper layer portion 11.

The intermediate layer portion 12 includes a plurality of elliptical section tubes 12 a whose cross sections have elliptical shapes. Meandering during use may be prevented by adopting tubes having these cross-sectional shapes, which will be described in detail below. A plurality of small holes 4 is provided in the upper layer portion 11 and a plurality of air holes 5 is provided in the elliptical section tubes 12 a as in the conventional insole 10.

FIGS. 2(a) to 2(c) illustrates an insole 21 in which an upper layer portion 14 is made of a sponge material and a lower layer portion 15 is made of a mesh material that is finer than that of the lower layer portion 13 of FIG. 1(c). For example, this insole 21 is used for athletic shoes worn by a runner of athletics. An impact on feet may be absorbed by forming the upper layer portion 14 with the sponge material. An intermediate layer portion 12 includes elliptical section tubes 12 a similarly to the insole 20 of FIG. 1(b).

FIG. 3(a) illustrates a case in which only a tube in a peripheral portion of the insole is configured as an elliptical section tube 12 b having a large diameter. When the diameter of the tube in the peripheral portion of the insole is set to be large in this manner, it is possible to stimulate the side part of the foot from the back of the heel, and to form a comfortable insole to wear. FIG. 3(b) illustrates an example of a case of employing trapezoidal section tubes 16 a and 16 b having trapezoidal sections in the tubes. When trapezoidal sections having flat bottoms are employed as described above, meandering of the tubes may be further prevented. In FIG. 3(b), the intermediate layer portion may include only the trapezoidal section tube 16 a having a small cross-sectional area.

[Usage State of Dampness Prevention Function-Equipped Insole]

FIG. 4(a) illustrates a usage state of the insole 20 using only the elliptical section tubes 12 a, and FIG. 4(b) illustrates a usage state the insole using the elliptical section tubes 12 a and the elliptical section tube 12 b having the larger diameter. As can be seen from FIGS. 4(a) and 4(b), the tubes may be stably restrained between the upper layer portion and the lower layer portion by forming cross sections of the tubes in elliptical shapes. As a result, meandering of the tubes is prevented, the position gap between the small holes 4 and the air holes 5 is eliminated, and a dampness prevention function is sufficiently exhibited. In addition, when the peripheral portion of the insole includes the elliptical section tube 12 b having a large cross-sectional area as illustrated in FIG. 4(b), it is possible to form an extremely comfortable insole to wear.

FIG. 5(a) illustrates a usage state of an insole using only the trapezoidal section tube 16 a, and FIG. 5(b) illustrates a usage state of the insole using the trapezoidal section tube 16 a and the trapezoidal section tube 16 b having a larger cross-sectional area. As seen from FIGS. 5(a) and 5(b), the tubes may be stably restrained between the upper layer portion and the lower layer portion by forming cross sections of the tubes in trapezoidal shapes. As a result, meandering of the tubes is prevented, and the position gap between the small holes 4 and the air holes 5 is eliminated. In addition, when the peripheral portion of the insole includes the trapezoidal section tube 16 b having a large cross-sectional area as illustrated in FIG. 5(b), it is possible to form an extremely comfortable insole to wear.

[Flow of Air Inside Dampness Prevention Function-Equipped Insole]

The Behavior of the insole 20 during walking will be described using the cross-section views of FIGS. 6(a) to 6(c). During walking, when the heel lands and the weight moves from the heel of the sole of the foot toward the toe as illustrated in FIG. 6(a), movement of air inside the tube 12 a having a hollow structure is compressed from the heel side in a direction toward the toe. A mass of compressed air illustrated in FIG. 6(b) moves toward a distal end of the elliptical section tube 12 a, and compressed air is released to a gap between the toes and bases of the toes through the small holes 4 of the upper layer portion 11 of the insole 20 from the air holes 5 bored at a distal end of the tube 12 a in an action of kicking the ground with tip of the toe illustrated in FIG. 6(c).

Compressed air discharged from the air holes 5 causes a flow of air around the toe. Thus, it is possible to reduce humidity due to perspiration between toes to prevent dampness, and to suppress generation of odor due to bacteria. In addition, when the lower layer portion 13 of the insole 20 is formed with the mesh cloth, moisture of the sole absorbed by skin forming the upper layer portion 11 is diffused to prevent the insole 20 from being damp, and an effect that dampness of the sole is prevented is exhibited.

Furthermore, while corrugated unevenness of the tube 12 a, and the mass of compressed air inside the tube 12 a moving as a result of walking, an acupressure effect that stimulates the whole sole of the foot is exhibited, and it is possible to reduce fatigue and recover from fatigue.

Hereinbefore, according to the present embodiment, it is possible to provide a dampness prevention function-equipped insole that sufficiently exhibits a dampness prevention function after use for a long time.

Embodiment 2

[Dampness Prevention Function-Equipped Slippers]

The present embodiment is an example in which the insole 20 described in Embodiment 1 is used to form slippers 40. FIG. 7 is a diagram illustrating an appearance of the slippers. In the slippers, the insole 20 is not used as an insole and is used as a slipper bottom piece. When the slippers are worn, it is possible to experience a feeling of walking on the lawn.

According to the present embodiment, it is possible to provide slippers which stimulate the sole of the foot, and thus are comfortable to wear, and may prevent dampness of feet.

Embodiment 3

[Shoe Using Dampness Prevention Function-Equipped Insole]

FIGS. 8(a) and 8(b) are diagrams illustrating an external appearance and an internal structure of a shoe using the insole described in Embodiment 1. As illustrated in FIG. 8(a), the shoe of the present embodiment includes a front air hole 30 a on a front side of the shoe and a rear air hole 30 b on a rear side of the shoe. The insole of the invention may be used for a shoe not having these air holes.

As illustrated in FIG. 8(b), outside air entering from the rear air hole 30 b passes through the tubes 12 a after passing through the small holes 4 and the air holes 5. Thereafter, the outside air is discharged to the outside from the front air hole 30 a by passing through the air holes 5 and the small holes 4 at the front side. A dampness prevention function of the insole may be further exhibited by actively passing the outside air through the inside of the shoe.

In FIGS. 8(a) and 8(b), reference symbols 30 c and 30 d indicate waterproof and moisture permeable materials. That is, reference symbols 30 c and 30 d indicate materials which allow air to pass through without passing water. Examples of the waterproof and moisture permeable material include Gore-Tex (registered trademark), etc. When the materials 30 c and 30 d are stuck on inner wall portions of the air holes 30 a and 30 b of the shoe, the dampness prevention function-equipped insole 20 may be safely used in a rainy day.

According to the present embodiment, it is possible to provide shoes using the dampness prevention function-equipped insole which stimulate the sole of the foot, and thus are comfortable to wear, and may prevent dampness of feet.

Embodiment 4

A dampness prevention function-equipped insole (hereinafter referred to as “insole”) of the present embodiment is illustrated in FIG. 9(a). In addition, a configuration of an insole 50 of FIG. 9(a) is illustrated in FIGS. 9(b) to 9(d). An upper layer portion 11 and a lower layer portion 13 of the insole 50 of the present embodiment are the same as those of the insole 20 of Embodiment 1 illustrated in FIG. 1, the upper layer portion 11 being a leather material having a plurality of small holes 4, and the lower layer portion 13 made of a mesh material.

In the insole 50 of the present embodiment, an intermediate layer portion 51 is different from the intermediate layer portion 12 of the insole 20 of Embodiment 1. In the intermediate layer portion 12 of Embodiment 1, the peripheral portion thereof has a substantially U-shape and includes the elliptical section tubes 12 a, and the plurality of linear elliptical section tubes 12 a having long and short lengths is disposed in a longitudinal direction of the foot at the inside. However, the intermediate layer portion 51 of the insole 50 of the present embodiment is different in that elliptical section tubes 12 a are installed in a transverse direction of the foot at a middle part of the foot while elliptical section tubes 12 a on the inside have linear shapes. The elliptical section tubes 12 a are installed in the transverse direction of the foot in the intermediate layer portion 51 as described above to prevent the dampness prevention function-equipped insole 50 from warping on both right and left sides of the foot. In the insole 20 of Embodiment 1, since all the linear elliptical section tubes 12 a of the intermediate layer portion 12 are disposed in the longitudinal direction, there is a problem that the insole 20 easily warps on both right and left sides. Further, the insole 20 may not be installed flat at the bottom of the inside of the shoe, or the insole 20 may gradually warp with use of the shoe. Then, dampness may not be sufficiently prevented at the inside of the shoe. The intermediate layer portion 51 of the insole 50 of the present embodiment includes the plurality of linear elliptical section tubes 12 a installed in the transverse direction of the foot, and thus it is possible to prevent right and left warps of the dampness prevention function-equipped insole 50, and to reliably prevent dampness on the inside of the shoe.

FIGS. 10(a) to 10(d) are diagrams illustrating another example of the insole of the present embodiment. FIG. 10(a) is an external view, and FIGS. 10(b) to 10(d) are diagrams illustrating a configuration thereof. In an insole 60 of FIGS. 10(a) to 10(d), an upper layer portion 61 is made of a coarse mesh material, and a lower layer portion 15 is made of a fine mesh material. In addition, an intermediate layer portion 62 is configured similarly to the intermediate layer portion 51 of FIGS. 9(a) and 9(b). However, circular section tubes 2 c having no air hole is used instead of the elliptical section tubes 12 c. The reason therefor is that since the upper layer portion 61 is made of the mesh material, air circulation inside the shoe is sufficient, and thus the air holes 5 may not necessarily be provided. Another reason therefor is that since the upper layer portion 61 does not have the small holes 4, positioning is unnecessary, and the insole 60 sufficiently functions with the circular section tubes 2 c. Therefore, the circular section tubes 2 c of the intermediate layer portion 62 absorbs air from a hole at an end portion thereof and discharges the absorbed air from a hole at another end portion. Elliptical section tubes 12 c may have a plurality of air holes 5. Then, air is more smoothly circulated when compared to a case in which the air holes 5 are not provided. However, there is a problem that cost is incurred to form the air holes 5. The insole 60 may be manufactured at a low cost, and is an insole from which right and left warps are excluded. The above-described slippers or shoes may be configured using the insoles 50 and 60 of the present embodiment.

According to the present embodiment, it is possible to provide a dampness prevention function-equipped insole that sufficiently exhibits a dampness prevention function even after use for a long time.

Embodiment 5

An upper layer portion 71 of an insole of the present embodiment is illustrated in FIG. 11(a), an intermediate layer portion 72 thereof is illustrated in FIG. 11(b), and a lower layer portion 73 thereof is illustrated in FIG. 11(c). The insole of the present embodiment is characterized in that a peripheral portion of the intermediate layer portion 72 includes a double-decker U-shaped circular section tube 2 c, and in that a double-sided adhesive tape 75 is stuck on a side peripheral surface of the lower layer portion 73.

Similarly to the insole 60 of Embodiment 4 of FIGS. 10(a) to 10(d), the upper layer portion 71 is made of a coarse mesh material, and the lower layer portion 73 is made of a fine mesh material. However, since the peripheral portion of the intermediate layer portion 72 includes the double-decker circular section tube 2 c having no air hole, the upper layer portion 71 and the lower layer portion 73 have side surface portions 71 a and 73 a rising at their edges thereof. In addition, the double-sided adhesive tape 75 is stuck on the surface of the side peripheral surface 73 a of the lower layer portion 73.

An actual usage state of the insole 70 of the present embodiment is illustrated in FIG. 12(a). FIG. 12(a) illustrates a case in which the intermediate layer portion 72 includes the circular section tubes 2 c having no air hole. However, FIG. 12(b) illustrates a case in which the intermediate layer portion 72 includes the elliptical section tubes 12 a having the air holes, and FIG. 12(c) illustrates a case in which the intermediate layer portion 72 includes the trapezoidal section tubes 16 a having the air holes. In every case, the double-sided adhesive tape 75 stuck on side parts of the lower layer portions 73 and 13 are stuck on side walls inside the shoe to prevent dampness prevention function-equipped insoles 70, 80, and 90 from moving inside the shoe 30.

As illustrated in FIGS. 12(a) to 12(c), the dampness prevention function-equipped insoles 70, 80, and 90 may circulate air on the side surface portion of the foot and absorb shock in the side surface portion of the foot. In particular, the insoles 70, 80, and 90 effectively function to protect feet of persons who play sports and prevent dampness.

A configuration of another insole of the present embodiment is illustrated in FIGS. 13(a) to 13(c). FIG. 13(a) illustrates an upper layer portion 101, FIG. 13(b) illustrates an intermediate layer portion 102, and FIG. 13(c) illustrates a lower layer portion 103. In the insole of FIGS. 13(a) to 13(c), the upper layer portion 101 is made of a coarse mesh material, and the lower layer portion 103 is made of a fine mesh material. The intermediate layer portion 102 includes circular section tubes 2 c having no air holes, and an edge thereof includes a triple-decker U-shaped circular section tube 2 c. For this reason, the upper layer portion 101 and the lower layer portion 103 include side surface portions 101 a and 103 a rising at their peripheral portions thereof. An actual usage example of this insole 100 is illustrated in FIG. 14(a). FIG. 14(b) is an example in which the upper layer portion 11 is made of a leather material having a plurality of small holes 4, and the intermediate layer portion is made of elliptical section tubes 12 a having air holes 5, and FIG. 14(c) is an example in which the intermediate layer portion includes trapezoidal section tubes 16 a having air holes 5. Similarly to the insole 70 of FIG. 12(a), a double-sided adhesive tape 75 is stuck on the surface of the side surface portion 103 a of the lower layer portion 103 of the insole 100 of FIG. 14(a).

When the circular section tubes 2 c, the elliptical section tubes 12 a, and the trapezoidal section tubes 16 a of the intermediate layer portions are configured in three layers as described above, the side part of the foot is protected by the double-decker tube, and impacts on the foot may be further relieved. Further, dampness of the side part of the foot may be reliably prevented. The above-described slippers or shoes may be configured using the insoles 70 and 100 of the present embodiment.

According to the present embodiment, it is possible to provide a dampness prevention function-equipped insole that sufficiently exhibits a dampness prevention function after use for a long time.

REFERENCE NUMERALS

-   -   4 small hole     -   5 air hole     -   6 sewing thread     -   11, 14 upper layer portion     -   12 intermediate layer portion     -   12 a, 12 b, 12 c elliptical section tube     -   13, 15 lower layer portion     -   16 a, 16 b, 16 c trapezoidal section tube     -   20, 21 dampness prevention function-equipped insole     -   30 shoe     -   30 a front air hole     -   30 b rear air hole     -   30 c, 30 d waterproof and moisture permeable material     -   31 shoe sole     -   40 dampness prevention function-equipped slipper     -   50, 60 dampness prevention function-equipped insole     -   51, 62, 72, 92 intermediate layer portion     -   61, 71, 91 upper layer portion     -   70, 80, 90 dampness prevention function-equipped insole     -   73, 93 lower layer portion     -   75 double-sided adhesive tape     -   100, 110, 120 dampness prevention function-equipped insole 

What is claimed is:
 1. A dampness prevention function-equipped insole comprising: an upper layer portion formed in a foot shape in which a plurality of small holes are formed on the upper layer portion; an intermediate layer portion including a plurality of tubes in which a plurality of air holes is bored at positions corresponding to the small holes, the plurality of tubes being installed in a front-rear direction of the foot shape at a front part and a rear part of the foot shape and being installed in a left-right direction of the foot shape in a middle part of the foot shape; and a lower layer portion in which a mesh cloth woven in a lattice shape is formed in the foot shape, wherein the dampness prevention function-equipped insole is formed in the foot shape and placed in a shoe, and wherein the upper layer portion, the intermediate layer portion, and the lower layer portion are sewn such that the plurality of tubes maintains a predetermined interval.
 2. The dampness prevention function-equipped insole according to claim 1, wherein cross-sectional shapes of the plurality of tubes have any one of a circular shape, an elliptical shape, and a trapezoidal shape.
 3. The dampness prevention function-equipped insole according to claim 1, wherein the upper layer portion is made of a leather material or a sponge material.
 4. A dampness prevention function-equipped insole comprising: an upper layer portion and a lower layer portion in which a mesh cloth woven in a lattice shape is formed in a foot shape; and an intermediate layer portion including a plurality of tubes, the plurality of tubes being installed in a front-rear direction of the foot shape at a front part and a rear part of the foot shape and being installed in a left-right direction of the foot shape in a middle part of the foot shape, wherein the dampness prevention function-equipped insole is formed in the foot shape and placed in a shoe, and wherein the upper layer portion, the intermediate layer portion, and the lower layer portion are sewn such that the plurality of tubes maintains a predetermined interval.
 5. The dampness prevention function-equipped insole according to claim 4, wherein the mesh cloth of the lower layer portion is finer than the mesh cloth of the upper layer portion.
 6. The dampness prevention function-equipped insole according to claim 1, wherein one of the plurality of tubes of the intermediate layer portion is formed in a U-shape from a heel part along a peripheral portion of a side part of a foot.
 7. The dampness prevention function-equipped insole according to claim 6, wherein a one-layer or two-layer tube formed in a U-shape is further loaded above the tube formed in the U-shape in the intermediate layer portion, and the upper layer portion and the lower layer portion have side surface portions to interpose the loaded U-shaped tube therebetween.
 8. The dampness prevention function-equipped insole according to claim 7, wherein a double-sided adhesive tape is installed on a surface of the side surface portion of the lower layer portion.
 9. A shoe having the dampness prevention function-equipped insole according to claim 1, wherein air holes are provided at a toe tip part and a heel part of the shoe.
 10. The shoe according to claim 9, wherein a waterproof and moisture permeable material is installed inside portions in which the air holes of the shoe are formed.
 11. A slipper in which the dampness prevention function-equipped insole according to claim 1 is used as a slipper bottom piece.
 12. The dampness prevention function-equipped insole according to claim 4, wherein one of the plurality of tubes of the intermediate layer portion is formed in a U-shape from a heel part along a peripheral portion of a side part of a foot.
 13. A shoe having the dampness prevention function-equipped insole according to claim 4, wherein air holes are provided at a toe tip part and a heel part of the shoe.
 14. The shoe according to claim 10, wherein a waterproof and moisture permeable material is installed inside portions in which the air holes of the shoe are formed.
 15. A slipper in which the dampness prevention function-equipped insole according to claim 4 is used as a slipper bottom piece. 